can she be a thief of Edward's heart and/or Elinor's happiness, when she knew Edward first?

Edward's family might say she was trying to steal the Ferrars fortune by marriage, but how sympathetic is the book to that perspective? (after all Edward's family thinks the same thing about Elinor).

I guess "Steele" works better for me as a more obvious pun/homonym on "steel," for the hardness of Lucy's heart, her tight grip on Edward and their engagement, and her resolve not to be driven off or yield. And maybe her nerves of steel, too, in playing the social games she does.
Descriptions of her eyes and glances as "sharp" and "bright" also suggests "steel" as in an opponent's sword. ("When the foeman bares his steel")